Re: DVD-RW writes but doesn't read

[Norbert van Nobelen <norbert-kernel@edusupport.nl>]

Did you try one of the disks you have written with it in another dvdplayer 
yet?

If the written dvds really work, then it is clearly a miracle (-:. The first 
thing the drive does, is a read action to see if it has an empty disc or 
something like multisession. If the drive reading is so terrible, that action 
should fail most of the time too.


On Wednesday 22 December 2004 00:33, you wrote:
> Hi Jens et al
>
> I have a laptop DVD-RW that is working fine when burning but has endless
> streams of errors with any kernel I try when trying to read anything
> (cd/dvd audio/video/data).
>
> hdc: command error: status=0x51 { DriveReady SeekComplete Error }
> hdc: command error: error=0x50
> ide: failed opcode was 100
> end_request: I/O error, dev hdc, sector 571832
> Buffer I/O error on device hdc, logical block 71479
>
> If I'm persistent I can read the data off the drive but I'll probably
> kill the drive in the process. It doesn't matter what iosched I use but I
> use cfq by default. I've tried disabling dma and so on without success. Any
> ideas?
>
> Con
>
>
> Here is some relevant data
>
> lspci -vvv
>
> 00:1f.1 IDE interface: Intel Corp. 82801DBM (ICH4) Ultra ATA
> Storage Controller (rev 03) (prog-if 8a [Master SecP PriP])
>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
> Stepping- SERR- FastB2B-
>         Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
> <TAbort- <MAbort- >SERR- <PERR-
>         Latency: 0
>         Interrupt: pin A routed to IRQ 10
>         Region 0: I/O ports at <unassigned>
>         Region 1: I/O ports at <unassigned>
>         Region 2: I/O ports at <unassigned>
>         Region 3: I/O ports at <unassigned>
>         Region 4: I/O ports at 1100 [size=16]
>         Region 5: Memory at 3e000000 (32-bit, non-prefetchable) [size=1K]
>
>
> hdparm -i /dev/hdc
>
> /dev/hdc:
>
>  Model=MATSHITADVD-RAM UJ-820S, FwRev=1.00, SerialNo=
>  Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
>  RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
>  BuffType=unknown, BuffSize=0kB, MaxMultSect=0
>  (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
>  IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
>  PIO modes:  pio0 pio1 pio2 pio3 pio4
>  DMA modes:  sdma0 sdma1 sdma2 mdma0 mdma1 mdma2
>  UDMA modes: udma0 udma1 *udma2
>  AdvancedPM=no
>  Drive conforms to: device does not report version:
>
>  * signifies the current active mode
>
>
> -
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